cmd/ctrld: add workaround for default iface name on Ubios

cmd/ctrld/cli.go

@@ -43,6 +43,7 @@ import (
 	"github.com/Control-D-Inc/ctrld/internal/router/firewalla"
 	"github.com/Control-D-Inc/ctrld/internal/router/merlin"
 	"github.com/Control-D-Inc/ctrld/internal/router/tomato"
+	"github.com/Control-D-Inc/ctrld/internal/router/ubios"
 )
 
 var (
@@ -975,6 +976,10 @@ func defaultIfaceName() string {
 		if oi := osinfo.New(); strings.Contains(oi.String(), "Microsoft") {
 			return "lo"
 		}
+		// Same as WSL case above.
+		if router.Name() == ubios.Name {
+			return "lo"
+		}
 		mainLog.Fatal().Err(err).Msg("failed to get default route interface")
 	}
 	return dri

cmd/ctrld/prog.go

@@ -249,7 +249,7 @@ func (p *prog) setDNS() {
 		// If ctrld is direct listener, use 127.0.0.1 as nameserver.
 		ns = "127.0.0.1"
 	} else if lc.Port != 53 {
-		ifaceName := defaultIfaceName()
+		ifaceName := iface
 		switch router.Name() {
 		case firewalla.Name:
 			// On Firewalla, the lo interface is excluded in all dnsmasq settings of all interfaces.